H CKInfo Items

HAL - Hardware Abstraction Layer

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(hal) An operating system component that lets programmers write device-independent code without the overhead normally seen with an API; an interface that might otherwise be used. More Information HAL Discussion Microsoft Definition Troubleshoot HAL

HD - High Density

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(H-D) A term applied to many things but, originally, in computers it was applied to the storage density of floppy disks. First, there was single density, then double density, and high density increased the 5.25-inch floppy to 1.2MB and 3.5-inch fl...

HDD - Hard Disk Drive

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(H-D-D) A general term used to describe disks that record data onto fixed platters spinning in an environmentally-controlled container. Hard disks have generally fast access times and connect to the computer via either IDE or SCSI interfaces. The ...

HDLC - High-level Data Link Control

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(H-D-L-C) An OSI data link layer protocol that allows devices to both control data flow and correct data errors. HDLC sessions can be normal unbalanced (secondary only responds to a primary), asynchronous (secondary can also contact primary), asyn...

HDML - Handheld Device Markup Language

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(H-D-M-L) A language that pre-dates Wireless Markup Language (WML), a language used to design Wireless Access Protocol (WAP) Web pages. More Information HDML FAQ

HDR - High Data Rate

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(H-D-R) High speed data technology from Qualcomm. More Information HDR Overview

HDTV - High-Definition Television

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(H-D-T-V) As the name implies, a form of television that increases definition (resolution) over current standards. HDTV uses digital signals versus the current analog standard. There are several picture sizes in the standard from a digital version...

HFS - Hierarchical Filing System

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(H-F-S) The name for a filing system organized in layers. A directory tree would represent one type of HFS. More Information Macintosh HFS Page

HMA - High Memory Area

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(H-M-A) The first 64K (minus 16 bytes) of extended memory (the 64K directly above the one megabyte point on an MS-DOS/Windows computer). The HMA is under the control of the driver HIMEM.SYS. The Intel 8086 and 8088 CPUs could only handle 1MB of me...

HMD - Head-Mounted Display

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(H-M-D) A virtual reality headset containing small displays for the eyes, audio output for the ears, and, often, head-tracking equipment to allow user feedback and system response. More Information WearComp Papers

HP - Hewlett-Packard

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(H-P) A large computer and electronics company founded in 1939. Widely known for printers, HP actually produces many different electronic devices from the simple to advanced computers. More Information HP Home Page

HP-GL - Hewlett-Packard Graphics Language

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(H-P-G-L) A printer language developed by Hewlett-Packard for controlling their output devices. HP-GL commands are interpreted by the printer or plotter in order to produce the intended output. To obtain the HP-GL specification contact Hewlett-Pac...

HPAS - Hypermedia Presentation and Authoring System

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(H-pass) A Java applet for Netscape under Windows designed to play back SMIL and HSL multimedia presentations. More Information HPAS Page

HPFS - High Performance File System

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(H-P-F-S) A follow-on to the FAT file system. Native to OS/2 (and being picked up by later Microsoft operating systems), HPFS allows long file names, offers better performance, and can handle disks that can store several trillion bytes. More Infor...

HSL - Hypermedia Synchronization Language

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(H-S-L) A format for creating synchronized multimedia presentations. A competitor to SMIL, HSL is being touted by Digital Research Corporation. More Information HSL Page

HSM - Hierarchical Storage Management

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(H-S-M) A data storage system that manages data across multiple storage devices, both fast and slow. The HSM attempts to anticipate data requests and moves data likely to be requested from slow to fast access devices and data that won't be require...

HTML - Hypertext Markup Language

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(H-T-M-L) A markup language which defines the structure of documents on the World-Wide Web. Elements of the language allow hypertext linking between documents. The language consists of text with embedded tags which can be open (e.g.,
fo...

HTTP - Hypertext Transfer Protocol

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(H-T-T-P) A data transfer protocol used to move Web pages and data across the Internet. More Information HTTP Overview

HTTPD - Hypertext Transfer Protocol Daemon (Server)

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(H-T-T-P-D) A program used to serve information via the Web. More Information NCSA HTTPD Page HTTPD Page